2020 Installation Guide

BI 7.2.3-46
Feb-2021, Rev 14
3
1.4 Ratings
System Fire Rating (ANSI / UL 2703)
Mechanical Load Rating (ANSI / UL 2703)
The QRail system has been mechanically tested according to UL 2703 Edition 1 to the following load ratings:
•
Downward Pressure: 10 PSF
•
Upward Pressure: 5 PSF
•
Down-Slope Load: 5 PSF
The QRail system is intended for roof mounting over a fire-resistant roof covering rated for the application. The QRail fire
rating is valid for the following:
•
Flush Mounted Systems with any roof slope with Module Types 1 and 2.Maximum system voltage is 1500 VDC
•
Tilt Mounted Systems for low roof slope (< 9.5°) applications with Module Types 1 and 2.
•
Any module-to-roof gap is permitted, with no perimeter guarding required (QSkirt is optional). This rating is applicable
with any third-party roof attachments.
•
Class A rated PV systems can be installed on Class A, B, and C roofs without aecting the roof fire rating.
Grounding & Bonding (ANSI / UL 2703)
This racking system may be used to ground and/or mount a PV module complying with UL 1703 only when the specific
module has been evaluated for grounding and/or mounting in compliance with the included instructions. The Universal Mid
Clamp has been evaluated for multiple use, with no location restrictions.
Product markings are located on the QMR-GLQ-A-50 Grounding Lug or Universal End
Clamp as shown in image 1.4.1.
Conforms to STD UL 2703 (2015) Standard for Safety First Edition: Mounting Systems,
Mounting Devices, Clamping/ Retention Devices, and Ground Lugs for Use with Flat-
Plate Photovoltaic Modules and Panels.
•
Maximum size of modules: 25.6 .
•
Maximum system voltage is 1500 VDC
•
Maximum Fuse Rating: 25A
•
Module orientation: Portrait and landscape.
Marking (ANSI / UL 2703)
ANSI / UL 2703
5003807
Image 1.4.1
QMR-GLQ-A-50 with
Product Marking